Improvement in machines for threading screws



" @Huit e time 'gmail JUDSON A. CLEAVE/LAND, OF LOGANSPORT', INDIANA.

Leners Pam No. 87,546, daad March 9,1869.

IMPROVEMENT IN MACHINES FOR THREADIN'G- SCREWS..

. The Schedule referred to in these Letters Patent and malng part of the same.

To all whom it 'ma/y conce/m:

Be it known that I, J UDsoN A. OLnAvELAND, of Logansport, in the county ofOass, and State of Indiana, have invented a new and valuable Improvement in Screw-Cutting Machines; and I do hereby declare that the following is a full, clear, and exact description of the construction and voperation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1, ofthe drawings, is a plan view of my device;

Figure 2 is a longitudinal section;

Figure 3 is an end view; and

- Figure 4 is a detail.

(ldy invention relates to machines for cutting screws.; an

It consists in providing more e'cient means, than have heretofore been devised, for holding the bolt upon which a screw-thread is to be cnt, and of introducing it to the cut-ter, by means of which a screw-threrui` of any required length, may be cut without difficulty.

It `.also consists in the arrangement of more perfect gearing thanhas heretoforebeen applied to, such ,Inaa chines.v l

The letter A, of the drawings, represents a frame, having four or more legs or standards, with top longitudinal bars, a.

rlhis frame has also bottom longitudinal bars, b.

Both these top-and bottom bars are adj usted in the frame by abolt-hend on one end, and a uut and screw on the other, in the manner shown, to the end that, the frame may be lengthened or shortened at will, and also that the frame maybe taken in pieces, to remove any defective or broken part, and supply the place thereof with a part that is perfect.

The bars a are made round, as shown in the drawings, for the reason hereinafter stated.

rBhe letter B is a stationary cross-bar, aiixed to the longitudinal bars a, inthe manner represented. It is of iron or other-metal, and is cast or hammered inthe form shown, with two clasps or bearings on each side, upon the rods al, and leaving a space between such bearings for the operations of the bevelled pinion C, hereinafter mentioned, and as representedon the dlawlugs.

The letter D is a shaft, adjusted in upright arms or shoulders of the cross-bar B, as shown; and i Letter E is a bevelled pinion, attached thereto, adapted to work with the pinion C.

The letter F isy a shaft, adjusted, in suitable bearings, upon the two parts of the cross-bar B, as shown, l

and heldin' piace by the removable caps c.

The pinion C is attached rmly to this shaft.

The shaft Fis made hollow, for the purpose of holding and operating the bolt upon which* a thread is to be cut,-

The letter G is a block, with a set-screw, u, in its top and bottom,fas shown, and its' centre is of a quad- 'rangular form, adapted to receive and hold the inner in cutting the threads.

end of shaftF, or it may be cast with said shaft in one rece. Y 4 p Thev letters s are removable or adjustable blocks, operated by the set-screws ain the square centre of the block G, adapted to receive and hold the end of a bolt, upon which I desire to cut a thread. I prefer to cast the block G with the shaft and pinion with which it operates, and adjust the blocks sin its square centre, instead of constructing them separately.

AThe letter H-is a sliding block, adjusted upon the bars a, in the manner shown. .It is moved Aba'clir' and forth upon said bars, as hereinafter mentioned.

The letter K is a hinged jaw, attached to the upper side of block H, as represented, the oice of which is, in connection with the sliding bar H, to hold the die by which the thread is cut.

The letter 'v is a hinged clamp, having a set-screw in its top, as shown, the office of which is to hold the jaw K securely in place, while the process of screwcutting is being carried on.

. My device is operated as follows:

I place the end of the bolt, upon which I desire to cut a screw-thread, next the die, inside the sliding block I-I, and adjust the opposite end between the blocks s, and secure it firmly by means of the setscrews n. The die is fixed in its appropriate place, between the jaw K and the sliding block H. The jaw K is secured in place by the clamp o and its set-screw. The operator now turnsthe crank of shaft D. lhe' pinions, meshing and working with each other, give Aa rotary motion to the bolt. The end of the boltpasses into the die, and the 'thread is cut. As fast as the thread is cut, the sliding block H is drawn forward thereby, until the thread is of the length required.

rllhe foregoing speciiies the construction and operation of my device in all its parts, except the dies used These dies are marked d on the drawings. Theyare constructed in two solid secitions, and adjusted firmly in suitable grooves or open# ings in the jaw and sliding bar respectively, as shown on the drawings, and are removable by the use of a hammer.

This inode of `construction and adjustment is believed to be' an improvement upon the dies in common use.

What I claim as myinvention, and desire to secure by Letters Patent, is

Thearrangement, herein specified and shown, of the severa] Aparts of themechanism on the supportingframe, in the manner described, 4and for the purposes set 'forth'.

[n testimony that I claimthe above, I have hereunto subscribed 'my name, inthe presence of two witnesses.

JUDSON A. CLEAVELAND..

.Witnesses: j

WM. WALLACE, WM. Hausmann. 

